The 740 - 1700 metre wide asteroid 2006 RO36 will make a close pass (70.9 lunar distances, 0.1823 AU), travelling at 12.76 km/second, to the Earth-Moon system on the 18th June, 2013 @ 07:04 UT ±00:01.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).